The federal government says it's in close contact with its American partners as the Biden administration escalates efforts to halt Canada's tax on large foreign digital services companies.

Premiers that share a border with Minnesota say Tim Walz understands America's important cultural and trade relationship with Canada, after the governor was chosen as Kamala Harris's running mate on the U.S. Democratic presidential ticket.

Observers expect Kamala Harris to follow President Joe Biden's roadmap for America's relationship with Canada as she moves to secure the Democratic party's presidential nomination.